Preparation And Applied Research Of CuS Nanomaterials

Metal sulfide have drawn great attention due to their excellent properties and exploited for various applications. Because of the nanoscale features nanomaterials have been the focus of research. For applications synthesis method of nanomaterials are of vitally importance. Traditional methods for preparation of nanomaterials have drawn backs such as expensiveness, drastic conditions and require complicated situation. The hydrothermal /solvothermal method is easier, cheaper and highyield. Thus, hydrothermal/solvothermal method is receiving increasing attention. In thispaper, we had studied a new synthesis route fornew morphology of CuS nanomaterials and CuS/TiO₂ composite fibers were controlled synthesized. Moreover the catalysis and photocatalysis properties of synthesized samples were studied.In this paper, new 3D structured nanorods and nanospheres were successfully prepared by a facile hydrothermal process using CuSO4 as Cu souse, S2O3 Na2 as S souse and PVA as shape control agent. The new method is a cheap and high productivity route and samples is uniform and monodispersed. Scanning Electron Microscopy（SEM） and Transmission Electron Microscopy（TEM） were used to characterize the morphologies of the samples. The information about the phases and chemical composition of samples was obtained byusing the following analytical techniques: Energy Dispersive X-ray（EDX）, X-ray powder diffraction（XRD）. nanosheet on CuS microrod shows crystal lattices with same spacing of 3.22 ?, which corresponds to the（101） plane of Covellite CuS crystals. Moreover, we found that as the auxiliary reagent of the reaction, PVA has significant effect on the morphology of CuS crystal growth. The catalytic property of the as-prepared CuS microspheres/microrods were testified by quantifying the degradation of methyl blue dye with H2O2 and the samples exhibited higher catalytic activity than CuS particles for the degradation of the simulation of pollutants.Titanium dioxide（TiO₂） based materials have drawn great attention due to their excellent properties, such as, non-toxicity and high oxidizing power. Therefore, Ti O2 has been exploited for various applications including photocatalysis, solar cell, gas sensor as well as biomedical application. As one of well-known photocatalysts, TiO₂ has proven to be the most promising and themost cost effective photocatalyst. Unfortunately, the TiO₂ materials are wide band semiconductor with defects of lacking visible light absorption and photogenerated charge carriers（electron-hole pairs） recombination. Meanwhile, a small fraction（ca.4%） of solar radiation is in the ultraviolet region. Thus, heterogeneous photocatalysis is a potential candidate for the degradation of high concentration of organic pollutants. To enhance the photocatalytic activity of TiO₂ in decolorization of organic dye, much effort has been made. Coupling TiO₂ with other semiconductors provides a beneficial solution for the defects in catalysis applications. By combing electrospinning technique with hydrothermal process CuS nanoparticles attached to the TiO₂ nanofibers form CuS/TiO₂ heterostructure. Also we have studied the factors which control the morphology of CuS by varying concentration of copper ion, sulfur source and other parameters. The morphologies and phase of these samples were characterized by XRD,TEM, HRTEM and SEM method. The photocatalytic activities of as-prepared samples were evaluated by degradation of methyl blue（MB） dye under illumination of light and the catalyst show enhanced catalysis activity. The feature of UV-Vis light absorption properties of the as-prepared CuS/TiO₂ fibers reveals that the photocatalyst has enlarged absorption in UV and visible region.